In 1979, Nikita M. Plaksin published a reportedly fascinating article containing 50 problems all related to the 50 moves rule. Unfortunately I can't find it anywhere, the only links that I could find are old and broken.
If anyone has it, would you please share it with the community and not let it get lost to time?
Last night, to my surprise, my reasking of this question over on the Matplus.net forums about received an; answer. There, a user by the name of Valery Liskovets provided a link to a PDF of the original article, which has pictures of all of the pages.
Here is the link: http://www.janko.at/Retros/Articles/Plaksin-50x50-Problem-1979.pdf
Hi Arnaud thanks for your question.
The problems themselves can all be found in pdb.dieschwalbe.de. Type K='50' AND A='Plaksin' AND S='Problem' AND YEAR='1979'. All 50 are there numbered, with solutions. If you are typing from a phone make sure that you select the correct single-quote character: the vertical one.
The query reveals that they were published in the now-defunct magazine Problem, but it does not give the article text. I suggest Arnaud that you send your request to the Retro Mailing List [email protected]. This will put you in touch with all the current retro greats who would probably love to hear from you.
If that doesn’t work then let me know and I will approach someone individually.
EDIT: the 50x50 article is now available at https://www.janko.at/Retros/Articles/index.htm in Russian but I guess that google translate will work - and the diagrams are the not important part.
